"I look at this generally as my third act," Douglas told ET. "I am also happy. I am cancer-free now, so you have a new appreciation and I think the combination of Behind the Candelabra and Liberace and now Ant-Man sort of opens my resume and my range of parts to play."

Douglas, 70, has been cancer-free since January 2011 after being diagnosed with stage four throat cancer in 2010.

Sadly, his mother Diana lost her battle with cancer on July 4 at the age of 92. The two-time Oscar winner was at the London premiere of Marvel's Ant-Man just days later, holding his family close. He told us that they had a tremendous influence on his decision to take on the role.